Burglar-alarm.



J. CHANKIN.

BURGLAR ALARM.

APPLICATION FILED AUG.2T. ms.

' Patented Mar. 21,1916.

WITNESSES THE COLUMBIA PLANOGRAPH C0-, WASHINGTON. D. c.

UNITED STATES PATENT ()FFICE.

JOSHUA CHANKIN, OF NEW YORK, N. Y.

BURGLAR-ALARM.

Application filed August 27, 1915.

To all whom it may concern:

Be it known that I, JOSHUA CHANKIN, a citizen of the United States, and a resident of the city of New York, borough of the Bronx, in the county of Bronx and 'State of New York, have invented a new and Improved Burglar-Alarm,of which the following is a full, clear, and exact description.

My invention relates to burglar alarms of the electrical type, and it has reference more particularly to the circuit-closing part of the alarm.

An object of the invention is to provide a simple and eflicient device which may be easily and quickly secured to a window or door, and which will automatically close the electrical circuit if the window or door provided with the device is tampered with.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts, as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a cross section of a window provided with my improved circuit-closing device for the alarm; Fig. 2 is a transverse section of a door and jamb thereof provided with my improved circuit-closing device of the alarm; Fig. 3 is a side elevation of the circuit-closing device; Fig. 4 is a transverse section on the line 44 of Fig. 3, and Fig. 5 is a longitudinal section of the circuitclosing device with a diagram of the wirmg.

Referring to the drawings, the circuitclosing' device comprises a tubular metallic member 6 having a' plurality of longitudinal slits 7 extending from one end of the member substantially through the entire length thereof, whereby the walls of the tubular member are rendered flexible. Fitting snugly into the tubular member 6 is an insulating tubular member 8. It is of a compressible nature, such as rubber, to allow the walls of the tubular member 6 to be depressed and contact with a head 10 of a.

Specification of Letters Patent.

Patented Mar. 21,1916.

Serial No. 47,623.

tubular members 6, preferably in close proximity to the slit end of the tubular member 6. The head 10 may be round, or flat as shown in the drawings. When it is flat it is placed at right angles to the displacement of the walls of the tubular member 6. A wire 11 extends from the metallic member 9, and a wire 12 from the tubular member 6. An insulating sleeve 13 is fitted to the nonslitted end of the member 6 which protects the connection of the wire 12 with the tubular member, and also incloses the projecting end of the insulating tubular member 8.

The wires 11 and 12 are provided with suitsecured to a window or door, a bore 19 is formed in the stiles of the window or door so that the end of the circuit closer engages the bore of the stile of the upper window. When the upper or lower window is tampered with, that is, moved, one of the walls of the tubular member 8 will be moved toward the head 10, closing the circuit of the alarm, which will be closed so long as the window sashes are not in normal position. WVhen the alarm is to be used on doors without boring, the circuit closer may be secured against the door by any suitable means, as, for example, eyelets 20 can be attached to the jamb of the door and the circuit closer placed in the eyelets, as shown in Fig. 2. A slight displacement of the door either way will close the circuit of the alarm.

While I have described the principle of operation, together with the device which I now consider to be the best embodiment thereof, I desire to have it understood that the device shown is merely illustrative and that such changes may be made as are within the scope of the appended claims.

I claim:

1. A circuit closer for burglar alarms, comprising,a tubular metallic member having longitudinal slits, an insulating tubular member within the metallic tubular member, a metallic member within the insulating tubular member having a portion thereof projecting into the metallic tubular member and adapted to contact with said tubular member when the walls thereof are depressed, and conductors from the inner and outer metallic members.

2. A circuit closer for burglar alarms, comprising,a tubular metallic member having a plurality of longitudinal slits extending from one end thereof substantially through the entire length of the tubular member and whereby the Walls thereof are rendered flexible, an insulating tubular member of compressible nature in the said tubular metallic member, a metallic member in said tubular insulating member having a head located within the metallic tubular member adjacent the slit end, and wires from said metallic members.

3. In a circuit closer for burglar alarms,

a tubular metallic member having longitudinal slits whereby the walls of the tubular member may be depressed, a soft rubber tube in said tubular member, a metallic member in said rubber tube having a portion thereof projecting into the metallic tubular member at the slitted end, and conductors from said metallic members.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSHUA CHANKIN.

Witnesses B. Jorrn, G. H. EMSLIE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

